Alfvén ion-cyclotron heating of ionospheric O+ Ions

  1. T. E. Moore,
  2. J. H. Waite Jr.,
  3. T. W. Moorehead and
  4. W. B. Hanson
  1. R. M. Winglee1,
  2. R. D. Sydora2 and
  3. M. Ashour-Abdalla1

Published Online: 18 MAR 2013

DOI: 10.1029/GM044p0205

Modeling Magnetospheric Plasma

Modeling Magnetospheric Plasma

How to Cite

Winglee, R. M., Sydora, R. D. and Ashour-Abdalla, M. (1988) Alfvén ion-cyclotron heating of ionospheric O+ Ions, in Modeling Magnetospheric Plasma (eds T. E. Moore, J. H. Waite, T. W. Moorehead and W. B. Hanson), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM044p0205

Author Information

  1. 1

    Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, California 90024

  2. 2

    Department of Physics, University of California, Los Angeles, Los Angeles, California 90024

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780875900704

Online ISBN: 9781118664414

SEARCH

Keywords:

  • Space plasmas—Mathematical models;
  • Magnetosphere—Mathematical models;
  • Ionosphere—Mathematical models

Summary

Transversely heated ionospheric ions, in particular O+ ions, are often observed flowing upward along auroral field lines. Currents observed in association with the tranversely heated ions can drive shear Alfvén waves and electrostatic ion-cyclotron waves unstable which can, in turn, be resonantly absorbed by the ions to produce the heating. Particle simulations are used to examine self-consistently the excitation of these waves and the associated heating. It is shown that the growth of the electrostatic ion-cyclotron waves quickly becomes suppressed as the ions become heated and the dominant wave fields are those of the shear Alfvén wave. The resultant transverse ion heating is larger and faster than that produced by solely electrostatic ion-cyclotron wave heating. Due to trapping of ions by the shear Alfvén wave, the temperature of the O+ ions remains comparable to that of the H+ ions.